ST5R00 STMICROELECTRONICS | Alldatasheet
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I REGULATED OUTPUT VOLTAGE I WIDE RANGE OF OUTPUT VOLTAGE I OUTPUT VOLTAGE ACCURACY ±5% I OUTPUT CURRENT UP TO 100mA I LOW RIPPLE AND LOW NOISE I VERY LOW START-UP VOLTAGE I HIGH EFFICIENCY (V OUT = 5V TYP. 87%) I FEW EXTERNAL COMPONENTS I VERY SMALL PACKAGE: SOT23-5L
DESCRIPTION
The ST5R00 is an high efficiency VFM Step-up DC/DC converter for small, low input voltage or battery powered systems with ultra low quiescent supply current. The ST5Rxx accept a positive input voltage from start-up voltage to V OUT and convert it to a higher output voltage in the 2.5 to 5V range. The ST5R00 combine ultra low quiescent supply current and high efficiency to give maximum battery life. The high switching frequency and the internally limited peak inductor current, permits the use of small, low cost inductors. Only three external components are needed: an inductor a diode and an output capacitor. The ST5R00 is suitable to be used in a battery powered equipment where low noise, low ripple and ultra low supply current are required. The ST5R00 is available in very small packages: SOT23-5L. Typical applications are pagers, cameras & video camera, cellular telephones, wireless telephones, palmtop computer, battery backup supplies, battery powered equipment. ST5R00 SERIES MICROPOWER VFM STEP-UP DC/DC CONVERTER Figure 1: Schematic Diagram SOT23-5L Rev. 6
Table 1: Absolute Maximum Ratings (*) Reduced by 1.7 mW for increasing in TA of 1°C over 25°C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditi on is not implied. Table 2: Thermal Data Figure 2: Connection Diagram (top view) Table 3: Order Codes Symbol Parameter Value Unit VOUT Output Voltage 5.5 V VIN Input Voltage 5.5 V VLX LX Pin Voltage 5.5 V ILX LX Pin Output Current Internally limited PTOT Power Dissipation at 25°C 170 (*) mW TSTG Storage Temperature Range -55 to 125 °C TOP Operating Junction Temperature Range -25 to 85 °C Symbol Parameter SOT23-5L Unit Rthj-case Thermal Resistance Junction-case 63 °C/W SOT23-5L OUTPUT VOLTAGES ST5R25MTR 2.5 V ST5R28MTR 2.8 V ST5R30MTR 3.0 V ST5R33MTR 3.3 V ST5R50MTR 5.0 V
Figure 5: Typical Demoboard Note: drawing not in scale. Table 4: Electrical Characteristics For ST5R25 (VIN = 1.5V, IOUT = 10mA, TA = 25°C, unless otherwise specified. For external components value, unless otherwise notes, refer to the typical operating circuit.) (1): The minimum input voltage for the IC start-up is strictly a function of the V F catch diode. Table 5: Electrical Characteristics For ST5R28 (VIN = 1.7V, IOUT = 10mA, TA = 25°C, unless otherwise specified. For external components value, unless otherwise notes, refer to the typical operating circuit.) (1): The minimum input voltage for the IC start-up is strictly a function of the V F catch diode. Symbol Parameter Test Conditions Min. Typ. Max. Unit VOUT Output Voltage 2.375 2.5 2.625 V VSTART-UP Start-up Voltage (VIN-VF) (1) I OUT = 1mA, VIN = rising from 0 to 2V 0.8 1.2 V VHOLD Hold-on Voltage I OUT = 1mA, VIN = falling from 2 to 0V 0.6 V ISUPPLY Supply Current To be measured at V IN, no load 16 µA RLX(DSON) Internal Switch RDSON ILX = 150mA 850 m Ω ILX(leak) Internal Leakage Current V LX = 4V, forced VOUT = 3V 0.5 µA fOSC Maximum oscillator Frequency 150 KHz Dty Oscillator Duty Cycle to be measure on LX pin 77 % ν Efficiency I OUT = 50mA 82 % Symbol Parameter Test Conditions Min. Typ. Max. Unit VOUT Output Voltage 2.66 2.8 2.94 V VSTART-UP Start-up Voltage (VIN-VF) (1) I OUT = 1mA, VIN = rising from 0 to 2V 0.8 1.2 V VHOLD Hold-on Voltage I OUT = 1mA, VIN = falling from 2 to 0V 0.6 V ISUPPLY Supply Current To be measured at V IN, no load 16 µA RLX(DSON) Internal Switch RDSON ILX = 150mA 850 m Ω ILX(leak) Internal Leakage Current V LX = 4V, forced VOUT = 3.3V 0.5 µA fOSC Maximum oscillator Frequency 150 KHz Dty Oscillator Duty Cycle to be measure on LX pin 77 % ν Efficiency I OUT = 50mA 82 %
Table 6: Electrical Characteristics For ST5R30 (VIN = 1.8V, IOUT = 10mA, TA = 25°C, unless otherwise specified. For external components value, unless otherwise notes, refer to the typical operating circuit.) (1): The minimum input voltage for the IC start-up is strictly a function of the V F catch diode. Table 7: Electrical Characteristics For ST5R33 (VIN = 2V, IOUT = 10mA, TA = 25°C, unless otherwise specified. For external components value, unless otherwise notes, refer to the typical operating circuit.) (1): The minimum input voltage for the IC start-up is strictly a function of the V F catch diode. Table 8: Electrical Characteristics For ST5R50 (VIN = 3V, IOUT = 10mA, TA = 25°C, unless otherwise specified. For external components value, unless otherwise notes, refer to the typical operating circuit.) (1): The minimum input voltage for the IC start-up is strictly a function of the V F catch diode. Symbol Parameter Test Conditions Min. Typ. Max. Unit VOUT Output Voltage 2.85 3 3.15 V VSTART-UP Start-up Voltage (VIN-VF) (1) I OUT = 1mA, VIN = rising from 0 to 2V 0.8 1.2 V VHOLD Hold-on Voltage I OUT = 1mA, VIN = falling from 2 to 0V 0.6 V ISUPPLY Supply Current To be measured at V IN, no load 17 µA RLX(DSON) Internal Switch RDSON ILX = 150mA 850 m Ω ILX(leak) Internal Leakage Current V LX = 4V, forced VOUT = 3.5V 0.5 µA fOSC Maximum oscillator Frequency 150 KHz Dty Oscillator Duty Cycle to be measure on LX pin 77 % ν Efficiency I OUT = 50mA 82 % Symbol Parameter Test Conditions Min. Typ. Max. Unit VOUT Output Voltage 3.135 3.3 3.465 V VSTART-UP Start-up Voltage (VIN-VF) (1) I OUT = 1mA, VIN = rising from 0 to 2V 0.8 1.2 V VHOLD Hold-on Voltage I OUT = 1mA, VIN = falling from 2 to 0V 0.6 V ISUPPLY Supply Current To be measured at V IN, no load 17 µA RLX(DSON) Internal Switch RDSON ILX = 150mA 850 m Ω ILX(leak) Internal Leakage Current V LX = 4V, forced VOUT = 3.8V 0.5 µA fOSC Maximum oscillator Frequency 150 KHz Dty Oscillator Duty Cycle to be measure on LX pin 77 % ν Efficiency I OUT = 50mA 83 % Symbol Parameter Test Conditions Min. Typ. Max. Unit VOUT Output Voltage 4.75 5.0 5.25 V VSTART-UP Start-up Voltage (VIN-VF) (1) I OUT = 1mA, VIN = rising from 0 to 2V 0.8 1.2 V VHOLD Hold-on Voltage I OUT = 1mA, VIN = falling from 2 to 0V 0.6 V ISUPPLY Supply Current To be measured at V IN, no load 18 µA RLX(DSON) Internal Switch RDSON ILX = 150mA 700 m Ω ILX(leak) Internal Leakage Current V LX = 4V, forced VOUT = 3.8V 0.5 µA fOSC Maximum oscillator Frequency 160 KHz Dty Oscillator Duty Cycle to be measure on LX pin 77 % ν Efficiency I OUT = 50mA 87 %
A Schottky diode with an high switching speed and a very low Forward Voltage (V F) is needed. Higher VF may cause lost power as heat in the diode, with a decrease of the Efficiency. Moreover, since the Output Voltage pin is also used as the device Supply Voltage, the Start-up Voltage (see related plots) is strictly due to the diode Forward Voltage at the rated Forward Current. A good diode choice is a STPS1L30A. INPUT/OUTPUT CAPACITORS SELECTION The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior of these elements. The output ripple voltage is the product of the peak inductor current and the output capacitor Equivalent Series Resistance (ESR). Best performances are obtained with good high frequency characteristics capacitors and low ESR. The best compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor, Lower values may cause higher Output Ripple Voltage and lower Efficiency without compromising the functionality of the device. An Input Capacitor is required to compensate, if present, the series impedance between the Supply Voltage Source and the Input Voltage of the Application. A value of 4.7µF is enough to guarantee stability for distances less than 2". It could be necessary (depending on V IN, VOUT, IOUT values) to proportionally increase the input capacitor value up to 100µA for major distances. In any case we suggest to connect both capacitors, C IN and COUT, as close as possible to the device pins.
DIM. mm. mils A 0.90 1.45 35.4 57.1 A1 0.00 0.10 0.0 3.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 1.50 1.75 59.0 68.8 e0 . 9 5 3 7 . 4 H 2.60 3.00 102.3 118.1 L 0.10 0.60 3.9 23.6 SOT23-5L MECHANICAL DATA 7049676C
DIM. mm. inch A 180 7.086 D 20.2 0.795 N 60 2.362 T 14.4 0.567 Tape & Reel SOT23-xL MECHANICAL DATA
Table 9: Revision History Date Revision Description of Changes 14-Jun-2005 6 The SOT-89 package has been removed, mistake on Fig. 3 IN ==> LX, on Tables 4, 5, 6, 7, 8 Output Noise Voltage ==> Efficiency.
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